Cross reference
1 Corinthians 14:27
27 if an `unknown' tongue any one do speak, by two, or at the most, by three, and in turn, and let one interpret;
1 Corinthians 14:26
26 What then is it, brethren? whenever ye may come together, each of you hath a psalm, hath a teaching, hath a tongue, hath a revelation, hath an interpretation? let all things be for building up;